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Boulder Opal
Sanidine
Sanidine and Boulder Opal Physical Properties


Physical Properties
Tenacity
-  
-  
Solubility
-  
-  
Durability
-  
-  
Specific Gravity
1.98-2.25  
2.54-2.61  
Fracture
Conchoidal  
Uneven  
Cleavage
None  
{001} Perfect, {010} Good  
Mohs Hardness
5-6.5  
6  
Chemical Composition
SiO 2 + H 2OUlrich Henn and Claudio C.  
KAlSi 3O 8Michael O’Donoghue , Gems, Sixth Edition (2006)  
Optical Properties >>
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